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The TESIS is a set of solar imaging instruments developed by the Lebedev Physical Institute of the Russian Academy of Science, and launched aboard the Russian spacecraft CORONAS-PHOTON on January 30, 2009. The main goal of the TESIS is to provide complex observations of solar active phenomena from the transition region to the inner and outer solar corona with high spatial, spectral and temporal resolution in the EUV and Soft X-ray spectral bands.
The TESIS includes five unique space instruments to observe the inner and outer solar corona from 0.2 to 4 solar radii in spectral band 290-320 A. With the advanced capabilities of its instruments, the TESIS will help better understand the physics of solar flares and high-energy phenomena and provide new data on parameters of solar plasma in the temperature range 105 - 107K.

The TESIS experiment started in the deep minimun between the 23rd and the 24th cycles of solar activity and planned to continue through all the razing phase of new cycle till 2012-2013.

Read more about TESIS

project diary

Solar activity hits a new low
The Sun has come all of one day away from breaking its record for the longest period of inactivity for the last decade – reaching a mid-summer low and falling into yet another state of “hibernation”. Yesterday, on the first day of autumn, new sunspots appeared on the surface of the Sun following an absence of almost 50 days. The small group of just two spots was registered by the NOAA as number 1025 when it formed yesterday in the Sun’s northern hemisphere close to its eastern limb. Astrophysicists had to wait almost two months for this event: the group of sunspots occupying the last line of the catalogue (number 1024), vanished from the solar disk on 11 July this year.
Solar activity hits a new low

The Sun – a summer without activity
Precisely one month ago, on 11 July 2009, the last active area of the new solar cycle disappeared from the surface of the Sun. Over the 30 days following this, neither observers on Earth nor devices in space have been able to detect the emergence of any sunspots. Due to the fact that the Sun has completed a full rotation around its axis during this period, it is possible to conclude that not only are there no sunspots on the side facing Earth, but that there are no sunspots on the entire surface of the Sun. Therefore, it seems that our star has once again returned to a state of deep solar “winter”, following several sparks of activity in May-June 2009. Today (12 August) marks the start of the second month of this solar inactivity.
The Sun – a summer without activity

Diary's archive

astronomy news

NASA's Spitzer Images Out-of-This-World Galaxy
NASA's Spitzer Space Telescope has imaged a wild creature of the dark -- a coiled galaxy with an eye-like object at its center.
Earth Seen By NASA's Moon Mapper On India's Chandrayaan-1 Spacecraft
A new image of Earth taken from 200 kilometers (124 miles) above the lunar surface was taken by the Moon Mineralogy Mapper, one of two NASA instruments onboard the Indian Space Research Organization's Chandrayaan-1 spacecraft.
Double Engine Fuels Star's Remarkable Nebula
ESO has just released a stunning new image of a field of stars towards the constellation of Carina (the Keel). This striking view is ablaze with a flurry of stars of all colors and brightnesses, some of which are seen against a backdrop of clouds of dust and gas. One unusual star in the middle, HD 87643, has been extensively studied with several ESO telescopes, including the Very Large Telescope Interferometer (VLTI)

Magnetic storms in the last 24 hours:

Geomagnetic storm was observed: G1 (minor)

Magnetic storms

Magnetic storms in the next 24 hours:

is not expected

Magnetic storm forecast

Current activity of the Sun:

Solar radio flux (10.7 cm) =
Mean planetary A index =
Mean planetary Kp index =
5 (95 nT)

Solar flares today

Solar photosphere
(Sun in the visible rays)
Photosphere in the encyclopedia

click image to view

Sunspot groups:
No sunspots and sunspot groups can be currently observed on the Sun's surface

Solar flocculi:
No H-alpha plages without spots can be currently observed on the Sun's surface